Analysis of Subsynchronous Torsional of Wind–Thermal Bundled System Transmitted via HVDC Based on Signal Injection Method

Wang, Junxi; Jia, Qi; Yan, Gangui; Liu, Kan; Wang, Dan

doi:10.3390/en14020474

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…Combining Equations ( 6), ( 8) and ( 11) divides out rotor voltage and current. The DFIG input impedance Z rdfig after considering the rotor controller is as follows: (12) where…”

Section: Dfig-based Frequency-domain Impedance Model Considering Rsc ...mentioning

confidence: 99%

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Sub-Synchronous Oscillation Suppression Strategy Based on Impedance Modeling by Attaching Virtual Resistance Controllers for Doubly-Fed Induction Generator

et al. 2022

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A sub-synchronous oscillation (SSO) suppression strategy of attaching virtual resistance controllers to the rotor-side converter (RSC) of the doubly-fed induction generator (DFIG) is proposed in this study to suppress sub-synchronous oscillation (SSO) caused by series compensation and grid connection of DFIG. A DFIG-based frequency domain impedance model considering RSC control under small signal perturbations is developed in a three-phase stationary coordinate system. Subsequently, the factors and mechanisms of SSO in the system with different phase sequences are analyzed in combination with the equivalent RLC resonant circuit of a DFIG-based series-compensated grid-connected system (SCGCS). SSO occurs when RSC and rotor winding generate a large equivalent negative resistance at the SSO frequency, resulting in a negative total system resistance. Additionally, the influences of series compensation degree (SCD) of line and inner loop parameters (ILPs) of RSC related to the total impedance of the system on the SSO characteristics are analyzed to optimize the parameters and improve the system stability. Based on the causes of SSO, virtual resistance controllers are attached to RSC to provide positive resistance to the system and to offset the equivalent negative resistance of RSC and rotor winding at the SSO frequency, thereby avoiding SSO of the system. Finally, time-domain simulations using power system computer aided design/electromagnetic transients including dc (PSCAD/EMTDC) show that the SSO of the system is effectively suppressed.

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“…Combining Equations ( 6), ( 8) and ( 11) divides out rotor voltage and current. The DFIG input impedance Z rdfig after considering the rotor controller is as follows: (12) where…”

Section: Dfig-based Frequency-domain Impedance Model Considering Rsc ...mentioning

confidence: 99%

“…The equivalent resistance R rdfig of the DFIG after considering the rotor converter can be obtained from Equation (12), as shown in Equation ( 13):…”

Section: Dfig-based Frequency-domain Impedance Model Considering Rsc ...mentioning

confidence: 99%

Sub-Synchronous Oscillation Suppression Strategy Based on Impedance Modeling by Attaching Virtual Resistance Controllers for Doubly-Fed Induction Generator

et al. 2022

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“…However, as the scale of wind power grid connection increases, subsynchronous oscillation accidents in wind power grid connection occur frequently [4][5][6]. In 2015, an SSO accident occurred at a direct drive wind farm in Hami, Xinjiang, when it was connected to the Xinjiang power grid via a long-distance non series compensation line, posing a serious threat to the safe operation of the power system [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Reduced order calculation method of subsynchronous oscillation mode of PMSG based wind farm connected with power grid based on Arnoldi method

Xu,

Liu,

Ming

2024

Sci. Tech. Energ. Transition

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Large scale wind turbine connected to the power grid is easy to induce subsynchronous oscillation. “Curse of dimensionality” will be encountered when subsynchronous oscillation mode is analysed and evaluated based on the full scale model of wind farm. It is urgent to study the fast and effective analysis method of wind farm interconnected subsynchronous oscillation. It is urgent to research the fast and effective analysis method of subsynchronous oscillation when wind farm is connected to power grid. Therefore, a reduced order calculation method of subsynchronous oscillation mode of PMSG based wind farm connected with power grid based on Arnoldi method is proposed..This method can quickly obtain the eigenvalues corresponding to the subsynchronous oscillation mode through iterative approximation when PMSG based wind farm connected to the power system. This method can be used to analyze subsynchronous oscillation of large-scale wind farm connected to the power grid, and provide an effective means for the evaluation of it. The effectiveness, applicability and rapidity of the proposed method are verified under stable and unstable states, different collector network structures and different wind farm scales. The results present that the proposed method can quickly and accurately obtain the subsynchronous oscillation mode in the system.

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“…Under the operating condition that direct-drive wind farms located in close proximity to the HVDC rectifier station, the mechanism of sub-synchronous interaction between them is explained in detail in Reference [13], and an analysis was conducted to explore the impact of controller parameters on SSO mode damping. In Reference [14], the additional excitation signal injection method is used to analyze the effect of control parameters, operating wind speed, and the number of grid-connected units on the damping characteristics of each torsional vibration mode of the synchronous generator set when the DC transmission capacity is fixed. Additionally, the mechanism of negative damping torsional vibration of the synchronous generator set shaft system is revealed.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

Wang

Chen

2023

Sustainability

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As the installed capacity of the power system is scaled up and the distance of transmission increases constantly, high-voltage direct current (HVDC) transmission technology has been widely applied across the power system. The HVDC system can lead to sub-synchronous oscillations (SSO) in the turbine and new energy generation systems. When the SSO caused by HVDC are studied through small signal analysis, it is usually necessary to establish the detailed state space model and electromagnetic transient model, which shows various disadvantages such as the high complexity of the model, the high order of the state space matrix, the complex calculation of eigenvalues, and the slow pace of simulation. In the present study, a simplified model intended for the HVDC transmission system is proposed, which can be used to simplify the calculation model and accelerate the simulation by omitting the high-frequency component and simultaneously keeping the sub-synchronous frequency component unchanged. The time domain simulation method is used to compare the dynamic response of the proposed simplified simulation model with that of the original detailed model, and the accuracy of the proposed model is demonstrated. The proposed simplified simulation model is applied to explore the SSO of wind-thermal power bundling in the HVDC transmission system. Additionally, the simulation results of SSO are compared by using the simplified model and the detailed model; the results of which demonstrate the effectiveness and rapidity of the simplified simulation model. The simplified model proposed can greatly improve the efficiency of SSO risk assessment. By selecting reasonable types and parameters of new energy units, SSO of the system can be avoided under risky operation mode, and the power grid operation mode can be monitored and adjusted to ensure the safe operation of the system. Finally, it can promote the sustainable development of the power system.

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Analysis of Subsynchronous Torsional of Wind–Thermal Bundled System Transmitted via HVDC Based on Signal Injection Method

Cited by 3 publications

References 15 publications

Sub-Synchronous Oscillation Suppression Strategy Based on Impedance Modeling by Attaching Virtual Resistance Controllers for Doubly-Fed Induction Generator

Sub-Synchronous Oscillation Suppression Strategy Based on Impedance Modeling by Attaching Virtual Resistance Controllers for Doubly-Fed Induction Generator

Reduced order calculation method of subsynchronous oscillation mode of PMSG based wind farm connected with power grid based on Arnoldi method

A Simplified Model of the HVDC Transmission System for Sub-Synchronous Oscillations

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